Yoshida Y, Takahashi K, Saito T, Tanaka K
Department of Civil Engineering, Graduate School of Science and Technology, Nihon University, 1-8-14, Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8308, Japan.
Water Sci Technol. 2006;53(6):21-7. doi: 10.2166/wst.2006.165.
An anaerobic/aerobic/anoxic/aerobic sequencing batch reactor (SBR) was operated with municipal wastewater to investigate the effect of nitrite on biological phosphorus removal (BPR). When nitrite accumulated, aerobic phosphate uptake activity significantly decreased and, in case of hard exposure to nitrite, BPR severely deteriorated. The interesting observation was that the relative anoxic activity of phosphate accumulating organisms (PAOs) increased after nitrite exposure. Moreover batch tests of aerobic phosphate uptake in the presence/absence of nitrite indicated that PAOs with the higher relative anoxic activity are less sensitive to nitrite exposure. From these results, we concluded that BPR is sensitive to nitrite exposure, but BPR containing PAOs with the higher relative anoxic activity is possibly more stable against nitrite than BPR containing PAOs with the lower relative anoxic activity.
采用厌氧/好氧/缺氧/好氧序批式反应器（SBR）处理城市污水，以研究亚硝酸盐对生物除磷（BPR）的影响。当亚硝酸盐积累时，好氧吸磷活性显著降低，若长时间暴露于亚硝酸盐中，生物除磷效果会严重恶化。有趣的是，亚硝酸盐暴露后，聚磷菌（PAOs）的相对缺氧活性增加。此外，在有/无亚硝酸盐存在的情况下进行的好氧吸磷批次试验表明，相对缺氧活性较高的聚磷菌对亚硝酸盐暴露不太敏感。根据这些结果，我们得出结论，生物除磷对亚硝酸盐暴露敏感，但含有相对缺氧活性较高的聚磷菌的生物除磷可能比含有相对缺氧活性较低的聚磷菌的生物除磷对亚硝酸盐更稳定。
